Payback time for soil carbon and sugar-cane ethanol

Payback time for soil carbon and sugar-cane ethanol

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ABSTRACT The effects of land-use change (LUC) on soil carbon (C) balance has to be taken into account in calculating the CO2 savings attributed to bioenergy crops1,2,3. There have been few


direct field measurements that quantify the effects of LUC on soil C for the most common land-use transitions into sugar cane in Brazil, the world’s largest producer 1,2,3. We quantified the


C balance for LUC as a net loss (carbon debt) or net gain (carbon credit) in soil C for sugar-cane expansion in Brazil. We sampled 135 field sites to 1 m depth, representing three major LUC


scenarios. Our results demonstrate that soil C stocks decrease following LUC from native vegetation and pastures, and increase where cropland is converted to sugar cane. The payback time


for the soil C debt was eight years for native vegetation and two to three years for pastures. With an increasing need for biofuels and the potential for Brazil to help meet global demand4,


our results will be invaluable for guiding expansion policies of sugar-cane production towards greater sustainability. Access through your institution Buy or subscribe This is a preview of


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CROPS ON SOIL CARBON SEQUESTRATION AND PROFITABILITY IN A TEMPERATE HUMID CLIMATE Article Open access 07 August 2020 COUNTERFACTUAL SCENARIOS REVEAL HISTORICAL IMPACT OF CROPLAND MANAGEMENT


ON SOIL ORGANIC CARBON STOCKS IN THE UNITED STATES Article Open access 04 September 2023 POTENTIAL OF LAND-BASED CLIMATE CHANGE MITIGATION STRATEGIES ON ABANDONED CROPLAND Article Open


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ACKNOWLEDGEMENTS We thank São Paulo Research Foundation — FAPESP (2011/ 07105-7), Shell Global Solutions (UK), Brazilian Bioethanol Science and Technology Laboratory — CTBE for financial


support. We thank all sugar-cane mills, associations and individual farmers who supported the soil sampling and provided access to field work. We also thank B. Ide and E.C. Reidel for their


valuable help in finding the comparison pairs and G. Ferrão for support and fieldwork organization. F.F.C.M. wishes to thank W. Clark, N. Dickson and the Sustainability Science Program at


the John F. Kennedy School of Government, Harvard University, for help and guidance during the writing and analysis process, and CAPES, CNPq and the Italian Ministry for Environment, Land


and Sea for the scholarship granted while this research paper was developed. AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Center for Nuclear Energy in Agriculture, University of São Paulo,


Piracicaba, SP, 13416-000, Brazil Francisco F. C. Mello & Carlos C. Cerri * Sustainability Science Program, John F. Kennedy School of Government, Harvard University, Cambridge,


Massachusetts 02138, USA Francisco F. C. Mello & N. Michele Holbrook * ‘Luiz de Queiroz’ College of Agriculture, University of São Paulo, Piracicaba, SP, 13418-260, Brazil Carlos E. P.


Cerri * Shell Technology Centre Houston, 3333 Highway 6 South Houston, Texas 77082, USA, Christian A. Davies * Department of Organismic and Evolutionary Biology, Harvard University,


Cambridge, Massachusetts 02138, USA N. Michele Holbrook * Department of Soil and Crop Sciences and Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, Colorado


80523, USA Keith Paustian * Instituto Federal de Alagoas, Maceió, AL, 57035-350, Brazil Stoécio M. F. Maia * Laboratório Nacional de Ciência e Tecnologia do Bioetanol — CTBE, Campinas, SP,


13830-970, Brazil Marcelo V. Galdos * Institut de Recherche pour le Développement — IRD, UMR Eco&Sols, 2 place Viala 34060 Montpellier, France, Martial Bernoux Authors * Francisco F. C.


Mello View author publications You can also search for this author inPubMed Google Scholar * Carlos E. P. Cerri View author publications You can also search for this author inPubMed Google


Scholar * Christian A. Davies View author publications You can also search for this author inPubMed Google Scholar * N. Michele Holbrook View author publications You can also search for this


author inPubMed Google Scholar * Keith Paustian View author publications You can also search for this author inPubMed Google Scholar * Stoécio M. F. Maia View author publications You can


also search for this author inPubMed Google Scholar * Marcelo V. Galdos View author publications You can also search for this author inPubMed Google Scholar * Martial Bernoux View author


publications You can also search for this author inPubMed Google Scholar * Carlos C. Cerri View author publications You can also search for this author inPubMed Google Scholar CONTRIBUTIONS


F.F.C.M., C.E.P.C., C.C.C. and C.A.D. designed the study and conducted the analyses. S.M.F.M. and K.P. developed the model to determine the LUC factors for sugar cane. All the authors


contributed to writing the paper. CORRESPONDING AUTHOR Correspondence to Francisco F. C. Mello. ETHICS DECLARATIONS COMPETING INTERESTS The authors declare no competing financial interests.


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al._ Payback time for soil carbon and sugar-cane ethanol. _Nature Clim Change_ 4, 605–609 (2014). https://doi.org/10.1038/nclimate2239 Download citation * Received: 18 November 2013 *


Accepted: 04 April 2014 * Published: 08 June 2014 * Issue Date: July 2014 * DOI: https://doi.org/10.1038/nclimate2239 SHARE THIS ARTICLE Anyone you share the following link with will be able


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